Like this:

When a Pilot determines that he/she will not be able to have 8 hours uninterrupted sleep opportunity and contacts the Airline, the clock is reset to just permit the 8 hours of sleep opportunity. It does not start a new rest period.

This differs from when the Airline contacts the crew member during the rest period, where the clock will need to be reset to permit the 10 hour rest period with the 8 hour sleep opportunity.

Like this:

The FAA released a clarification concerning the definition of a Nighttime operation.

A nighttime operation is simply an FDP that is scheduled to infringe on the WOCL.

Thus, if a FCM is scheduled for 4 FDP’s where FDP’s 1, 2 and 4 are scheduled to infringe upon the WOCL with no scheduled mid-duty break of 2 hours or more, and FDP 3 is scheduled to end before the start of the WOCL the FCM is legal.

If FDP is delayed and ends after the start of the WOCL the FCM is still permitted to operate FDP #4.

The FAA cautions that FDP #3 must have been realistically scheduled not to infringe upon the WOCL.